Things I enjoy: plot, character interaction, exploring a canon world, interesting use of superpowers (especially the less overtly powerful ones), crossovers, established relationships, teammates to lovers, enemies to lovers.
Do Not Wants: non-con or rape; non-canon permanent character deaths (canon deaths are fine); mentor/student, adult/teen or adult/child sexual interaction; zombies; apocalyptic or post-apocalyptic AUs; mundane AUs; cancer.
I've listed a huge array of characters, so I'm going to be fairly general in this letter. What I'm really looking for in this exchange is women being competent, and women focused on their relationships with women. "Competent" doesn't have to mean victorious or heroic - as you can see from my several villain nominations - but I really like to see characters who have goals, whether it's relationship goals or taking over New York or saving the world or all of the above! In art terms, I like to see characters doing something, whether fighting together or fighting each other or maybe learning/training together, or on a date in the clouds. I like complex heroes with flaws and complex villains who think they're doing the right thing.
I would also like to assure you that although I am a long-time comics fan, I am absolutely not a canon purist in any shape or form. I don't care if Volume 2 Issue #126 of Ladies Comics in 1978 had the same first meeting as you want to write or draw - I want to see your version. You want to only use one particular version of canon, that's great! If you want to bring in movieverse canon to comics or comics backstory to movies, I will enjoy it. About the only part of Marvel that I'm not really into is the cosmic stuff like Guardians of the Galaxy (Asgardians excepted), so I may not be so up on that.
If you have any questions, ask my partner st_aurafina.